Relax version requirements to enable build with older py-setuptools versions.

--- pyproject.toml.orig	2026-02-26 10:28:55 UTC
+++ pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=64", "wheel"]
+requires = ["setuptools", "wheel"]
 build-backend = "setuptools.build_meta"
 
 [project]